Glass structure.



OQ A, MYGTT.

GLASS STRUCTURE.

APPLICATION FILED SBM. 20, 1907.

1,097,042. y atented May 19, 1914.

2 SHEETS-SHEET 1.

INVENTOR W! TNESS 5 0. A. MYGATT. GLASS STRUCTURE.

APPLIMToN FILED SEPT. 2o, 19o?.

, Patentedmay 19,1914.

WHA/3355 ma@ v INVENTOR @n a. ma#

E Attorneys' ons a amener, or NEW YORK, N. r. .u

eLASs 'srEUorUnE may concer/'aff f Be itknownthat, Crise. MYGA'IT, a

citizen of the United States, residing at New York city, inthe State of NewYork, have invented new and useful Improvements in Glass Structures, of which the following is a specification.

In the use of double reflecting prisms, formed upon the surface of glass structures designed mainly for use in reflecting light from a more' or less concentrated light source, the problem is an easy one if the sheet or plate of glass is curved substantially concentric with the .light source. ln the concentric disposition double reilecting specular prisms of about 90 give excellent results, for each prism. is arranged, with respect to the light source, so as to present. angles of about "v thereto. Considerable diiiiculty arises however where the prisined sheet or plate is straight or non-concentric, and the light source concentrated. In such a case if the double prisms be substantially 90 prisms, those lying at right angles to the light source will be highly` elcient,`while those on either side lwill not be so eiiicient, each prism farther away from the maximum reflecting point getting less and less etiiscientbecause the rays oflight are more and more oil the proper reiiecting angles.

To rovide a. straight or non-concentric reiiecting prism glass structure which is highly eiicient substantially throughout, from a concentrated light source, is the object of my invention. t

In the drawing is shown diagrammatically in section a straight sheet .of glass which is bent angularly into rectangular form, for illustrative purposes.

Figure 1 is a'plan of the under or inner side of a reflector embodying my invention;

, this particular Fig. 2 is a side elevation Gand Figg., .3 is a horizontal section of aption oflmy' rellector drawn on an enlarged scale.

. The double prisms 1,A at right-angles to the light source 6, are aboutl 90"v prisms.

.Each 4prism 2, 3 and 4, etc., either side of the prisms 1, are made with such varying angles as will give the maximum reiiection at that point. Or, to state it diiierently, in exemplification, each of the double prisms 1, 2, 3, 4, 5, etc., are disposed so as to present twosubstantially 45 sur- I Specification of ietters Patent. apuestan aieasepeihbereo, 1907. serial Na. 393,811'.

Patented May i9, 1914.

faces to the light source, at right angles thereto, and the angle of each prism varies from its neighbor on either side. Where the glass structure is not straight, but the surviace is non-concentric'to the source of light,

similar disposition is made. These prismed reflectors give a practically uniform lightdistribution from a concentrated light source. Such prisms are so disposed that the ray or' light passes through the apices of each of them at substantially the same angle. In the symmetrical arrangement about a common center the ribs or vprisms may be parallel or radiating from the non-concen tric glass body. The side opposite the ribbed or prism side may be smooth ci' ribbed. v

The form of the reflector may be of any polygonal elliptical or non-concentric shape.

The glass structure is not confined in its The arrange-4 use to reflectors or shades. ment ofribs or prisms such as are here described rnay be applied to any form of Glass structure where it is desired to produce lightmodifying effects.

By the word non-concentric as used in the specifioation`and`claims is meant any con- `iguration havin straight or curved sides,

the surface of w lch is non-concentr1c to a given source of light. For example, the body might be symmetrically disposed about a source of light in a polygonal structure and the lightemodifying s rface thereof not,

be concentric to the light ource.

claim: l, "l

' 1. A olass reli'ector having its sides nonconcentric; to an artificial source of light within and formed] with prisms, each pre senting its sides at substantially an angle of 45 to said source of light.

9.. A glass refiector having its sides no nconcentric to an artificial source of light within and formed with prisms, each pre'' senting its sides at substantially an angle -o 45". to said source of light, said reliector having a plane surface opposite said prisms. In testimony whereof I have subscribed my name'in the presence of two witnesses.

oTis A. arrears. Witnesses:

F. B; BROCK., ROBERT KELLY, Jr. 

